docs(webpack): remove deprecated browserDynamicPlatform

closes #2109

Author: sarunint

public/docs/_examples/webpack/ts/src/main.ts

@@ -1,5 +1,5 @@
 // #docregion
-import { browserDynamicPlatform } from '@angular/platform-browser-dynamic';
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
 import { enableProdMode } from '@angular/core';
 
 import { AppModule } from './app/app.module';
@@ -10,5 +10,5 @@ if (process.env.ENV === 'production') {
 }
 // #enddocregion enable-prod
 
-browserDynamicPlatform().bootstrapModule(AppModule);
+platformBrowserDynamic().bootstrapModule(AppModule);
 // #enddocregion